Venturi Plate with Abrupt Protrusions for Gas Purification
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Solution Overview
Problem
Existing gas purification technologies, such as spray towers and venturi scrubbers, are either expensive or require large amounts of energy, and face challenges when dealing with flue gases from oxyfuel burners, where adding air as an oxidant complicates subsequent carbon dioxide separation due to nitrogen addition.
Innovation Solution
A venturi device with a plate comprising multiple venturi tubes and abrupt protrusions to enhance turbulence, supporting a bed of liquid absorbent, which increases contact surface and efficiency while minimizing nitrogen addition by using a recirculation system and controlled absorbent supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spray towers are used for gas purification, then reliability is improved, but device size and cost increase due to large throughput volumes required
Solution Approach 1:
The plate is segmented into multiple venturi tubes arranged in parallel, allowing the gas flow to be divided into multiple streams. This segmentation increases the total contact surface area between gas and absorbent without requiring a large overall device volume, thus maintaining reliability while reducing device size.
2Productivity
If venturi scrubbers are used to produce finer drops for better separation, then purification efficiency is improved, but operating cost increases
Solution Approach 1:
The venturi tubes create dynamic turbulence through their constriction geometry, which naturally breaks the liquid absorbent into fine drops without requiring additional energy input. The abrupt protrusions further enhance this dynamic effect, improving purification efficiency while maintaining low operating costs.
3Productivity
If bubble beds are used with stirring action to achieve good yield, then separation efficiency is improved, but energy consumption increases
Solution Approach 1:
The venturi tubes generate self-sustaining turbulence through their constriction geometry, creating fine drops and enhancing mass transfer without requiring external stirring mechanisms. This self-service approach achieves good separation efficiency while eliminating the energy consumption associated with mechanical stirring.
4Reliability
If air is added as oxidant to the absorbent, then oxidation of reaction products is improved, but nitrogen contamination of purified gases increases
Solution Approach 1:
The oxidant is introduced in a controlled manner through the absorbent recirculation system, changing the oxidation conditions to achieve reliable sulfur dioxide removal. By controlling the oxidant addition through the liquid phase rather than direct gas phase addition, nitrogen contamination is minimized while maintaining oxidation efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Achieves high purification yields, up to 99% collection efficiency, with reduced energy costs and compact design, effectively handling flue gases from oxyfuel burners without adding nitrogen to the purified gases.
Implementation Method 1
the venturi tubes each comprises a respective centrally arranged constriction in which the velocity of the gas is increased, so that turbulence arises as gas streams through the constriction
Implementation Method 2
turbulence arises as gas streams through the constriction
Data Source
Figure 1~2
AI summary
Plate (6) arranged to support a bed of liquid absorbent in a device for purifying gas, which plate (6) comprises an upper and a lower side when the plate (6) is arranged in an operating position in which it is mounted in the device, wherein the plate (6) comprises a plurality of venturi tubes (6a), arranged next to each other, through the plate (6) and in the form of through holes running between the lower and the upper side, wherein the venturi tubes (6a) are arranged to lead gas that is to be purified from a space below the plate (6) when in said operation position, through the venturi tubes (6a) and up to the bed of absorbent, and wherein the venturi tubes (6a) each comprises a respective centrally arranged constriction in which the velocity of the gas is increased, so that turbulence arises as gas streams through the constriction. The invention is characterised in that the venture tubes each comprises a respective abrupt protrusion from the inner wall of the venturi tube at the respective place for the said constriction, arranged to further increase the turbulence of the gas streaming through the respective tube.